What are the coordinates of the primaries of Kodak Endura, or Fuji Crysal archive paper

Discussion in 'Wet Process Machine & Traditional Prints' started by Ted Baker, Feb 24, 2018.

  1. Ted Baker

    Ted Baker Member
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    Not sure where to post this?

    I am interesting in any technical information, that has the coordinates in XYZ, for the dyes used in any modern RA-4 photographic paper (actually any RA-4 paper)? Or any similar standard or matrix to/from any standard colorspace.?

    I have some plots for cinema print film, which I assume are not too far these.

    Already exhausted my google skills.
     
  2. BMbikerider

    BMbikerider Member
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    I am not sure what information you are searching for. However I use both types of paper and my findings are that they are very similar, but there are variations. The Fuji paper is the only one available in cut sheet, whilst the Kodak RA4 comes in continuous rolls. I find that the filtration values are very similar, with the Kodak requiring a slightly heavier filtration, typically 70M and 75Y whilst the Fuji performs well with 65M and 70Y.

    The Fuji paper also seems to be a bit more sensitive than Kodak and will fog just that bit quicker when exposed to the light from my DUKA 50 safe-light set at Level 10 at the same distance from the diffused light source. The Fuji will show pale cyan traces at after 20 seconds whilst the Kodak will survive un-fogged for at least 30 seconds I also find that the Kodak paper to be on a slightly thicker base than the Fuji. Also when both are exposed through the same negative the Kodak seems to have a slightly higher contrast. The surface of the glossy paper on the Kodak version is slightly glossier and better.

    Personal preference - the Kodak wins every time

    Not very clinical or technical I know, but this is what I found by experience over 27 years of colour printing.
     
    Last edited: Aug 8, 2018
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    Ted Baker

    Ted Baker Member
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    Thanks for you reply. I am was just hoping for some technical info about the dyes in the print. As in what colours the actual dyes are colorimetricly, and any formulas use to transform those values to and from any other colorspace.
     
  4. Photo Engineer

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    You might try work by Sir Robert Hunt OBE. He got his "gong" for this type of work.

    Bob taught the course and wrote the book for EK.

    PE
     
  5. ced

    ced Member

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    Ted Baker

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    Thanks I will do that. BTW the previous recommendation by Giorgianni was great!
     
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